I know it's a lot different than what you have going but I found this post and am going to set mine up very similarly very soon, if not this weekend.
http://67-72chevytrucks.com/vboard/s...4&postcount=10
He ran it on the axle with the sway bar end links behind the axle. He added a 1" spacer between the frame and each bracket to achieve the correct width at the frame.
The way you have it, it looks a lot like the CPP setup and that seems to work well too so I don't think you could go wrong either way
